EDIT: Did some Googling, and two very good pieces of news - (1) Robert Glasper did an original score, and (2) Herbie Hancock is in charge of compiling a proper soundtrack. !!

That really depends on whether Herbie is in his artistic mood or his commercial mood... unfortunately he's produced his fair share of drivel. You'd hope given the context he'd do the right thing. Early '70s Miles was vicious, explosive music... I hope they don't smooth the edges off for the sake of wider appeal.